umountrepo

#!/bin/bash
#
# unmount cvmfs repositories that were mounted with mountrepo
# Written by Dave Dykstra 17 April 2019
#


usage()
{
    echo "Usage: umountrepo [-z] {repo.name|-a}" >&2
    exit 1
}

LAZY=false
if [ "$1" = "-z" ]; then
    LAZY=true
    shift
fi

if [ $# != 1 ]; then
    usage
fi

if [ -n "$CVMFSEXEC_CMDFD" ] && [ -n "$CVMFSEXEC_WAITFIFO" ]; then
    # this is within cvmfsexec, requesting to umount a repo
    if [ -z "$CVMFSUMOUNT" ]; then
        echo "$0: umount within cvmfsexec only works through \$CVMFSUMOUNT interface" >&2
        exit 1
    fi
    if $LAZY; then
        echo "$0: lazy umount not supported within cvmfsexec" >&2
        exit 1
    fi
    if [ "$1" == "-a" ]; then
        echo "$0: umount within cvmfsexec only works with one repo" >&2
        exit 1
    fi
    REPO="$1"

    # Send command to the "parent" process still outside the namespace.
    # "Parent" is in quotes because the linux process tree gets reversed and
    #   it is actually a linux child.  It is a parent environment-wise though.
    echo UMOUNTREPO $REPO >&$CVMFSEXEC_CMDFD
    exec {CVMFSEXEC_CMDFD}>&- # close it, no longer needed
    # wait until that process is finished mounting
    read RET <$CVMFSEXEC_WAITFIFO
    exit $RET
fi


HERE="$(cd `dirname $0` && pwd)"
DIST="$HERE/dist"

if [ "$1" = "-a" ]; then
    set -- `mount|grep " $DIST"|awk '{print $3}'`
else
    set -- $DIST/cvmfs/$1
fi

if [ "`id -u`" == 0 ]; then
    # most likely this is actually a "fake" root
    ISROOT=true
else
    ISROOT=false
fi

for REPO; do
    if $LAZY; then
        echo "Lazily unmounting $REPO"
        if $ISROOT; then
            umount -l $REPO
        else
            fusermount -uz $REPO
        fi
    else
        echo "Unmounting $REPO"
        if $ISROOT; then
            umount $REPO
        else
            fusermount -u $REPO
        fi
        rmdir $REPO
    fi
done